Haven't even had to really configure anything either, my IF showed up in Jack, tweaked the buffer as you would in windows and that was it. Probably are things I can tune but even hogs like large Cardinal patches run fine currently.
I think you just need to take your time, ask on forums, get to know the file system (approaching it with a Windows mentality is bad, I found that out
So, yeah, totally possible to make music with Linux, sorry some people have so much trouble but a blanket statement 'it doesn't work for music' is just not true.